ACCESSORIES A. Operators:

1. Operators shall be designed with a safety factor of 5 for torsional and shear stresses. The operating mechanism shall be so located and so designed that parts subject to maintenance shall be easily accessible.

2. Manual operators shall be so sized that a maximum of 80 pounds of rim force per pull is required for operation.

3. Positions of operators shall be approved by ENGINEER.

4. Gate shall be made to open when turned to the left or counterclockwise.

5. The direction of the operator to open position shall be indicated on the operator.

6. Bevel Gear: Bevel gear activators shall provide vertical mounting of the handwheel.

Handwheels shall be included.

7. Crank/Handle: Cranks shall be cast iron with a rotating brass grip. They shall be a maximum of 15 inches in length and keyed to the operator nut.

8. Chainwheel: Chainwheels shall be cast iron and furnished complete with chain and guides.

Chain shall be galvanized and shall be looped to extend to within 4 feet of the floor below the valve.

9. Handwheel: Handwheels shall be fabricated steel. They shall be a maximum of 30 inches in diameter and keyed to the operating nut.

10. Wrench Head: Wrench heads shall be cast iron with set screw. They shall be furnished for wrench nuts except where extension stems or T-handle wrenches are required.

11. Wrench Nut: Wrench nuts shall be provided with a 2-inch operating nut when a T-handle wrench or extension stem is required. Other wrench nuts shall be furnished with a wrench head.

B. Motor Operators:

1. Electric Motor Open-Close Service:

a. Electric motor operators for open-shut service shall meet the requirements of AWWA C501 Motor-Operated Lift Mechanisms except as hereinafter specified.

b. Controls shall be either "integrally mounted" or separated in a "wall-mounted" enclosure.

The type to be supplied will be designated on Schedule. Deviations from Schedule will not be accepted.

c. Electrical equipment shall be mounted in a NEMA 4 enclosure, unless shown otherwise on Schedule.

City of Flint WPC

d. Motorized gate operators shall include the motor, reversing starter with remote-local switch, associated gearing, limit switches, torque switches, auxiliary handwheel for manual operation, a mechanical dial position indicator, open-close-stop push-buttons, and accessories as listed on Schedule.

e. Motorized gate operators scheduled with "wall-mounted" controls shall include the motor, reversing starter and remote-local switch mounted in the valve body or the wall-mounted enclosure at the manufacturer's option, associated gearing, limit switches and torque switches mounted in the valve body, auxiliary handwheel for manual operation, a valve-mounted mechanical dial valve position indicator, the wall-valve-mounted control enclosure, and accessories as listed on Schedule.

f. The wall-mounted control enclosure shall include gate "open" (amber) and "closed" (green) indicating lights, a remote-local switch even if there is a remote-local switch at the gate body, open-stop-close push-buttons and a terminal strip to accept incoming and outgoing wires.

g. Wires shall be tagged at each end of the wire with individual wire markers. Each terminal of the terminal strips shall be numbered and identified with a marker. Schematics shall be provided with Shop Drawings showing wire numbers, terminals, field wiring, etc.

Connections for remote equipment shall be wired to terminal blocks. Equipment shall be factory wired and tested before shipment.

h. The motor starters shall be the reversing contactor type complete with gang-operated switch, two mechanically interlocking reversing contactors, 120 volt control power transformer when motor voltage is other than 120 volt, thermal overload protection for each phase, and associated wiring.

i. Limit switches shall be provided at the extreme open and close position of the operator travel. At least 2 independent switches at each end of motor travel shall be provided as standard for the local indicator lights and interlocking. An additional 4 switches shall be provided for remote use.

j. Torque switches shall be provided in both the open and closed circuits of the operators.

The torque switches shall be field adjustable and designed to stop the operator motor when the torque exceeds safe limits for either the operator or the gate. An electrical or mechanical interlock shall be provided to prevent the open torque switch from tripping when unseating a torque-seated valve.

k. A local mechanical dial position indicator shall be provided on the gate operator to indicate the position of the gate.

l. Motors shall be standard duty rated, totally enclosed nonventilated, Class B insulated, 60 hertz with voltage and phase as noted on Schedules, especially designed for gate service. The design shall combine low inertia with a high starting and stalling torque. The motors shall be sized to operate the gate slide at a rate of 10-12 inches per minute under the full specified unbalance operating head stated on Specifications. The motor winding temperature rise shall be NEMA standard for Class "B" insulation at the rated service factor load.

m. Gear case shall be cast iron. Pedestals shall be fabricated steel or cast iron. Stem nut shall be high-tensile bronze.

n. Mechanical emergency operation in event of power failure shall be provided by a clutchable handwheel drive mechanism completely independent from the motor gearing.

Hand operation shall be direct drive permitting fast manual gate operation. Failure of motor gearing shall not prevent emergency handwheel operation. Manual operation shall prevent (disconnect) electrical operation.

City of Flint WPC

2. Electric Motor Throttling Service:

a. Electric motor operator for throttling service on the gates shall meet the requirement of AWWA C501 Electric Operators except as herein specified. Enclosures shall be NEMA 4 unless shown otherwise on Schedule.

b. The housing and covers shall be of cast aluminum or cast iron. Mechanical parts shall be designed for safety factor of at least 2. Construction of the operator shall be such that it may be mounted in any position required to facilitate manual operation. Manual operation of the gates shall be possible by a handwheel attached to the mechanism. Power to motor circuit shall be automatically disconnected to prevent accidental electric operation during manual operation. A mechanical dial position indicator shall be provided to continuously indicate valve position. Operator bearings shall be self-lubricating type or lubricated for life before operator is sealed at the factory.

c. The operator motor shall be heavy-duty with continuous duty rating and totally enclosed and nonventilated. The motor shall be equipped with thermal overload protection.

d. The power supplied shall be 115V single phase, 208V single phase, 230V single phase, 208/230V 3-phase, or 460V 3-phase, plus or minus 10 percent at 60 hertz as shown on Schedule. The motor supplied shall conform to the voltage specified.

e. The winding temperature rise shall meet NEMA standard for the class of insulation used at the rated service factor load. The motor shall be for high-torque, variable-speed duty. The motor shall be reversible. A 4-20 mA throttling signal shall be provided by others. Control interface electronics, motor controller, and appurtenances to accept this signal and position the gate between 0 and 90 degrees, based on the value of the throttling signal, shall be provided with the gate operator. The controller shall be provided complete with NEMA 4 enclosure, auto-manual selector switch, and open-close push-buttons. Controller shall be completely solid state; contactors are not acceptable. Motor and controller shall be suitable for over 1,000 starts per hour. Controllers shall accept an isolated 4-20 mA signal for gate positioning from a remote source.

f. The gear train shall be pre-selected to have open-close operating time from 1-3 minutes as shown on Gate Schedule.

g. Limit switches shall be provided at the extreme open and close position of the operator travel. At least two independent switches at each end of motor travel shall be provided as standard for a local indicator and interlocking. An additional switch shall be provided at each end for remote use.

h. Motor circuit limit switches shall be of the direct-break type. Limit switches shall be adjustable. Limit switch contacts shall be isolated. Auxiliary switches for secondary functions shall be of the cam-operated, spring-leaf type. The operator shall be equipped with a torque switch for protection in the closing direction. An electrical or mechanical interlock shall be provided to prevent the open torque switch from tripping when unseating a torque seated valve. In the event of power failure, the operator shall lock in the last control position until power is restored or switched over to standby power, or the manual operating handwheel is engaged.

i. Torque switches, limit switches, and motor thermal switches are to be mounted as required inside the housing and connected to the master terminal strip. Provisions shall be made for 2 internal potentiometers for feedback on control operations. Wiring within operator shall be incorporated in a standard laced wiring harness using compression connectors and terminal strips. Internal wiring shall be UL approved for 105 degrees C operation.

Insulation shall be suitable for 600 volts.

j. Wires shall be tagged at each end of the wire with individual wire markers. Each terminal of the terminal strips shall be numbered and identified with a marker. Schematics shall be provided with Shop Drawings showing wire numbers, terminals, field wiring, etc.

City of Flint WPC

Connections for remote equipment shall be wired to terminal blocks. Equipment shall be factory wired and tested before shipment.

C. Miscellaneous:

1. One complete set of wrenches, spanners, and other tools necessary for the adjustment and dismantling of the equipment shall be furnished. Standard open end and pipe wrenches need not be included among these tools, but socket wrenches and offset wrenches, which can be used to better advantage than standard open wrenches, shall be included among the tools to be furnished with the equipment.

a. Wrenches and spanners shall be case-hardened steel forgings and shall have a bright finish with working faces dressed to fit nuts.

b. The gate shall be shipped as fully assembled as is practicable.

c. The shipping crates shall be provided with skids and lifting devices for crane slings.

d. Devices not attached to the gate during shipment shall be packed in boxes and properly labeled for assembly. Such equipment shall be shipped machined and fitted. No machining of parts in assembly shall be required.

2. Bench Stand: Bench stands shall meet the requirements of floor stands as herein specified, except that baseplates shall replace pedestals.

3. Extension Stem/Shaft (Length): Extension stems shall be 304 or 303 stainless steel with bronze couplings. Stems of more than one section shall be jointed by bronze couplings threaded and keyed to the stems. Extension stems shall have a 2-inch wrench nut end connection for T-handle wrench operation.

a. Extension shafts shall be 304 or 303 stainless steel with universal joint couplings.

4. Floor Stand:

a. Floor stands shall meet the requirements of AWWA C501 for Manual Operating Mechanism except as herein specified.

b. Floor stands shall be a high-strength cast iron pedestal type furnished with lubrication fittings and stainless steel, double-nutted anchor bolts.

c. Geared floor stands shall have weatherproof housings.

d. Floor stands shall be provided with a galvanized steel stem cover and position indicator, and the direction of rotation to open the gate shall be indicated.

e. The operating stem will be 304 or 303 stainless steel. On aluminum gates the stem shall be connected to the disc by means of an aluminum angle connection, threaded and bolted for the stem and welded to the disc.

f. A sleeve made from standard-weight galvanized steel pipe shall be provided for the opening in the floor beneath each operating stand.

g. Connections of stems to stainless steel or fiberglass gates shall be as per the manufacturer's recommendations.

5. Position Indicator: Position indicators shall be of bronze or cast iron construction.

6. Stem Cover: Stem covers shall be clear PVC with position indicators and cap.

7. Stem Guide: Stem guides shall be cast iron ASTM A 126, Class B construction with bronze bushings adjustable in two directions and furnished with mounting assembly and anchor bolts of stainless steel. The minimum thickness of any portion shall be 1/2 inch.

8. Wall Bracket: Wall brackets shall be cast iron and furnished with stainless steel assembly and anchor bolts.